インテル® Fortran コンパイラー 19.0 デベロッパー・ガイドおよびリファレンス
Elemental Intrinsic Function (Generic): Performs a circular shift of the rightmost bits.
result = ISHFTC (i,shift[,size])
i |
(Input) Must be of type integer. |
shift |
(Input) Must be of type integer. The absolute value of shift must be less than or equal to size. |
size |
(Input;optional) Must be of type integer. The value of sizemust be positive and must not exceed BIT_SIZE( i). If sizeis omitted, it is assumed to have the value of BIT_SIZE( i). |
The result type and kind are the same as i. The result value is obtained by circular shifting the size rightmost bits of i by shift positions. If shift is positive, the shift is to the left; if shift is negative, the shift is to the right. If shift is zero, no shift is performed.
No bits are lost. Bits in i beyond the value specified by size are unaffected.
For more information on bit functions, see Bit Functions.
The model for the interpretation of an integer value as a sequence of bits is shown in Model for Bit Data.
Specific Name |
Argument Type |
Result Type |
|---|---|---|
BSHFTC |
INTEGER(1) |
INTEGER(1) |
IISHFTC1 |
INTEGER(2) |
INTEGER(2) |
JISHFTC |
INTEGER(4) |
INTEGER(4) |
KISHFTC |
INTEGER(8) |
INTEGER(8) |
1Or HSHFTC. |
||
ISHFTC (4, 2, 4) has the value 1.
ISHFTC (3, 1, 3) has the value 6.
The following shows another example:
INTEGER(1) i, res1
INTEGER(2) j, res2
i = 10 ! equal to 00001010
j = 10 ! equal to 00000000 00001010
res1 = ISHFTC (i, 2, 3) ! rotates the 3 rightmost
! bits by 2 (left) and
! returns 00001001 = 9
res1 = ISHFTC (i, -2, 3) ! rotates the 3 rightmost
! bits by -2 (right) and
! returns 00001100 = 12
res2 = ISHFTC (j, 2, 3) ! rotates the 3 rightmost
! bits by 2 and returns
! 00000000 00001001 = 9